Liu Hongpeng, Wang Rui, Wang Baohua, Li Li, Jiao Xinying, Song Qinggong, Yu Dan
Appl Opt. 2019 Mar 10;58(8):2042-2049. doi: 10.1364/AO.58.002042.
Reversibility and repeatability of the tensile deformation response in holographic sensors formed by highly stretchable acrylamide polymers have been investigated. The diffraction spectrum of the volume grating was used to characterize the deformation. Two-way shifts of peak wavelengths, i.e., redshift in transmission and blueshift in reflection, were observed in stretching. The reduction of the average refractive index provided experimental evidence for the physical mechanism. To achieve a linear response and high repeatability, the limitation of tensile displacement was determined as 5.0 mm, and the relevant deformation is 6.6%. This value can be considered as a boundary between the elastic and plastic deformations in samples with thicknesses less than 120 μm. There was a totally linear relation between peak wavelength and deformation within the elastic range. The reversible and repeatable deformation response validated the practical applicability of a holographic sensor.
对由高拉伸性丙烯酰胺聚合物形成的全息传感器中拉伸变形响应的可逆性和可重复性进行了研究。利用体光栅的衍射光谱来表征变形。在拉伸过程中观察到峰值波长的双向移动，即在透射中出现红移，在反射中出现蓝移。平均折射率的降低为物理机制提供了实验证据。为了实现线性响应和高重复性，将拉伸位移的限制确定为5.0毫米，相关变形为6.6%。该值可被视为厚度小于120μm的样品中弹性变形和塑性变形之间的界限。在弹性范围内，峰值波长与变形之间存在完全线性关系。可逆和可重复的变形响应验证了全息传感器的实际适用性。
